The 1st thing that happens to a Landlord when the tenants are causing trouble is the city declares the property a public nuisance.When the property is declared a public nuisance the landlord is fined every time the police need to show up to the home & or the landlord is told to evict the tenants.

They typically want 2 pay stubs, 2 tax returns, insurance declaration pages, copies of lease, etc.

@David M. good catch on the foreign parents, I missed that, but are you sure about not having to declare? 

Talk to a qualified CPA or EA and let them know your whole picture (way too many variables come into play here) to make sure you are declaring your interest legally and in the most beneficial manner.

In most CC&Rs/states, a 67% vote is required to amend the declaration and when "use" is affected, a 90% vote is required.

the future side of this is still an unknown quantity so its a risk that should be evaluated carefully.There are also several bills currently proposed in WA legislature which are likely to pass in some form or other which will substantially affect your situation - look at SB 5139 - "temporary" rent control   and SB 5160 - extending COVID protections for 2 YEARS past end of declared emergency,   payment plans based on "tenants ability to pay"  and blocking use of eviction and payment history in tenant screening  (!!!!) 

If the damage is bad enough, maybe they can declare it uninhabitable and you can use that to force the tenant out.

@Sandy GabinIf you decide to ask them to leave, you will have to wait until the eviction moratorium in MA has ended, which is currently the sooner qof August 18, or 45 days after the covid19 emergency declaration is lifted.

Now that I've publicly declared that I'm going to operate with zero vacancies, I cannot afford to be lazy just because I typically have a strong cash flow.

Then, if you pay your overseas taxes, it will generally make absolutely no sense to "cheat" on your domestic taxes because the surplus you'd have to pay to your own country will generally be lower than the credit you can claimed against the taxes you paid overseas.Also, the people who evade taxes generally will do so by not declaring their properties overseas.